﻿/************************************************************************

   Extended Silverlight Toolkit

   Copyright (C) 2010-2012 Xceed Software Inc.

   This program is provided to you under the terms of the Microsoft Public
   License (Ms-PL) as published at http://extendedsilverlight.codeplex.com/license

   Please purchase a commercial version of this toolkit if you are using
   it in a commercial product. The commercial versions support the project,
   and also include more features for each control, priority support,
   source code, updates, removed watermark, and a proprietary license.

   Visit http://xceed.com and follow @datagrid on Twitter.

  **********************************************************************/

using System;

namespace Xceed.Silverlight.Data.Stats
{
  public class StatResult
  {
    #region Constructor

    public StatResult( object value )
    {
      m_value = value;
    }

    internal StatResult( object value, bool isEstimate )
    {
      m_value = value;
      m_isEstimate = isEstimate;
    }

    #endregion

    #region Value Property

    public object Value
    {
      get
      {
        return m_value;
      }
    }

    private object m_value;

    #endregion

    #region IsEstimate Property

    internal bool IsEstimate
    {
      get
      {
        return m_isEstimate;
      }
      set
      {
        if( value != m_isEstimate )
        {
          if( !value )
            throw new InvalidOperationException( "The IsEstimate property cannot be changed once it has been set.");

          m_isEstimate = value;
        }
      }
    }

    private bool m_isEstimate; //false

    #endregion

    internal StatResult ToEstimate()
    {
      if( m_isEstimate )
        return this;

      return new StatResult( m_value, true );
    }
  }
}
